November 1998
Intermediate to advanced
526 pages
14h 38m
English
Content preview from Java Servlet ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
The Session Tracking API
Fortunately for us servlet developers, it’s not always necessary for a servlet to manage its own sessions using the techniques we have just discussed. The Servlet API provides several methods and classes specifically designed to handle session tracking on behalf of servlets. In other words, servlets have built in session tracking.[32]
The Session Tracking API, as we call the portion of the Servlet API
devoted to session tracking, should be supported in any web server
that supports servlets. The level of support, however, depends on the
server. The minimal implementation provided by the servlet classes in
JSDK 2.0 manages sessions
through the use of persistent cookies. A server can build on this
base to provide additional features and capabilities. For example,
the
Java Web Server has the ability to revert to using URL rewriting when
cookies fail, and it allows session objects to be written to the
server’s disk as memory fills up or when the server shuts down.
(The items you place in the session need to implement the
Serializable interface to take advantage of this
option.) See your server’s documentation for details pertaining
to your server. The rest of this section describe the
lowest-common-denominator functionality provided by Version 2.0 of
the Servlet API.
Session-Tracking Basics
Session tracking is wonderfully elegant. Every user of a site is
associated with a
javax.servlet.http.HttpSession
object that servlets can use to store or retrieve information ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.